Digital Alarm Clock | Digital Timer

Just Do Electronics April 25, 2020

How to make a Digital Alarm Clock | Digital Timer

Circuit Diagram :-

Code :-

 
//Prateek
//www.prateeks.in

#include <EEPROM.h>
#include <DS3231.h>
#include <LiquidCrystal.h> // includes the LiquidCrystal Library
#include <Keypad.h>

DS3231 rtc(SDA, SCL);
LiquidCrystal lcd(12, 11, 10, 16, 15, 14); // Creates an LC object. Parameters: (rs, enable, d4, d5, d6, d7) 

const byte ROWS = 4; //four rows
const byte COLS = 4; //three columns

char keys[ROWS][COLS] = {
  {
    '1',
    '2',
    '3',
    'A'
  },
  {
    '4',
    '5',
    '6',
    'B'
  },
  {
    '7',
    '8',
    '9',
    'C'
  },
  {
    '*',
    '0',
    '#',
    'D'
  }
};

byte rowPins[ROWS] = {9,8,7,6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5,4,3,2}; //connect to the column pinouts of the keypad

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String phNumber;
String storedHour;
String storedMinute;
int buzzer = 13;

void storeMinute(String);
void storeHour(String);

void setup() {

  Serial.begin(9600);
  rtc.begin();
  lcd.begin(16, 2);
  lcd.clear();

  storedHour = getHour();
  storedMinute = getMinute();

  pinMode(buzzer, OUTPUT);
  digitalWrite(buzzer, LOW);

}

void loop() {

  delay(1000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Alarm:");
  String storedAlarmTime = storedHour + ":" + storedMinute + ":00";
  lcd.print(storedAlarmTime);

  lcd.setCursor(0, 1);
  lcd.print(" Change Alarm ");
  
  char key = keypad.getKey();
  if (key) {

    digitalWrite(buzzer, HIGH);
    delay(100);
    digitalWrite(buzzer, LOW);

    //Set alarm
    if (key == '*') {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("*Set Hour:");
      String enteredHour = getInputFromKeyBoard(2);

      if (enteredHour.length() == 2) {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("*Set Minute:");
        
        String enteredMinute = getInputFromKeyBoard(2);
        
        if (enteredMinute.length() == 2) {
          
          storeHour(enteredHour);
          storeMinute(enteredMinute);
          storedHour = enteredHour;
          storedMinute = enteredMinute;
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Alarm set to");
          lcd.setCursor(0, 1);
          String alarmTime = enteredHour + ":" + enteredMinute + ":00";
          lcd.print(alarmTime);
          delay(1000);
          
        }
      }
    } else {
      lcd.clear();
      lcd.print("Invalid Option!");
    }

  }

  String timeString = rtc.getTimeStr();

  String realHour = timeString.substring(0, 2);
  String realMinute = timeString.substring(3, 5);

  String currentTime = realHour+":"+realMinute+":00";

  delay(1000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Time:"+currentTime);
 
  Serial.print("Time ");
  Serial.println(currentTime);

  if (realHour.equals(storedHour) && realMinute.equals(storedMinute)) {

    soundAlarm();

  }
  
}

String getInputFromKeyBoard(int n) {

  String num = "";
  String number;
  String confirmNumber;
  int i = 0;

  while (1) {
    char key = keypad.getKey();
    if (key) {

      digitalWrite(buzzer, HIGH);
      delay(100);
      digitalWrite(buzzer, LOW);

      if (key == '0' || key == '1' || key == '2' || key == '3' || key == '4' || key == '5' || key == '6' || key == '7' || key == '8' || key == '9') {
        i++;
        if (i <= n) {
          num += key;
        }

        Serial.println(num);
        
        lcd.setCursor(14, 0);
        //lcd.clear();
        lcd.print(num);
        
        lcd.setCursor(0, 1);
        lcd.print("*Cancel #Confirm");

      }

      if (key == '#' && i == n) {
        break;
      }

      if (key == '*') {
        number = "";
        confirmNumber = "";
        num = "";
        return "";
      }

      if ((key == '#' || key == 'A' || key == 'B' || key == 'C' || key == 'D') && i < n) {
        lcd.clear();
        lcd.print("Invalid Number!");
        delay(2000);
        number = "";
        confirmNumber = "";
        num = "";
        return "";

      }

      if (i > n) {
        lcd.clear();
        lcd.print("Invalid Option!");
        delay(2000);
        number = "";
        confirmNumber = "";
        num = "";
        return "";
      }

      if (i == n && (key == 'A' || key == 'B' || key == 'C' || key == 'D')) {
        lcd.clear();
        lcd.print("Invalid Option!");
        delay(2000);
        number = "";
        confirmNumber = "";
        num = "";
        return "";

      }

    }

  }
  return num;
}


void storeHour(String n) {
  for (int k = 0; k < 2; k++) {
    EEPROM.write(k, String(n[k]).toInt());
  }

}


void storeMinute(String n) {
  for (int k = 0; k < 2; k++) {
    EEPROM.write(k+2, String(n[k]).toInt());
  }

}


String getHour() {
  String newHour = "";
  for (int i = 0; i < 2; i++) {
    newHour += EEPROM.read(i);
    Serial.println(EEPROM.read(i));
  }
  return newHour;
}


String getMinute() {
  String newMinute = "";
  for (int i = 2; i <4; i++) {
    newMinute += EEPROM.read(i);
    Serial.println(EEPROM.read(i));
  }
  return newMinute;
}

void soundAlarm() {

  digitalWrite(buzzer, HIGH);


}

0 Comments